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J. P. SNYDER. Electro-Magnetic Burglar-Alarm. No. 103,383. Patented May24-, 1870..

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dinitexl fitatw gem other JAMES P.*SNYDER, OF BROOKLYN, NEW'YORK.

Letters Patent N0.-103,3S3, dated May 24,1870.

OTHER PURPOSES.

The Schedule referred to in these Letters Patent and making part of thesaine.

To allwhom it'nmy concern Be it known that I, JAMES .P. SNYDER, ofBrooklyn, in the county of Kings and State of New York, have inventedanew and improved Automatic Magnetic Indicator; and I do hereby declarethat the following is a full, clear, and exact. description thereof,which will enable others skilled in the art to make and use the same,reference being had tocthe'accompanying drawings forming part of thisspecification.

, This invention relates to improvements in themagnetic burglar-alzu'mapparatus used in houses, hotels, and the like, to sound alarms whenefi'orts are made to enter bysraising windows oi opening doors; and

It consists in an arrangement for setting in action automatically asecondary circuit, which will continue the alarm, although the circuitfirst set in action may he suddenly stopped again by the shutting of thedoor or window by the burglar on hearing the alarm.

The invention also consists in an arrangement for causing the armatureto effect the uncovering of the name .or number of the room from whichthe alarm proceeds.

g with the battery, the alarm, and the room or part of Similar lettersof referenceindicate correspondingparts.

A is one end of the coil of wire of the elect-ro-n'iagnet B.

O is the other end;

D is the armature of the l electro-magnet B, attached to one end of ametallic rod or bar, working on pivots E near the magnet. The fartherend of this bar or rod passes through a plate, F, (a nonsconductor ofelectricity,) and rests in a slotin a disk or other device, G.

This disk is hung to the plate by a pin, H, which passcsthrouglrit andthe plate on either side or near its bottom, in such a manner that whenthe rod or bar is withdrawn from the slot the disk or other device mayfall, and in its fall uncover a portion of the plate, (upon which isindicated the name or number of theroom which the wire A is to guard,)that is covered when the bar or rod is in the slot.

This pin isjjrmly attached to the disk or device, so that, upon itsfidl, the pin may be turned.

Attached to the back of the pin is a metallic spring H, which the disk,in falling, brings into contact with another metallic spring, H

A wire, I, connects one pole ofthe battery with the spring H; the springH is connected with the wire A by the wire H The operation of theindicator is as follows;

A wire connected with one of the poles of a galvanic battery, L, leadsto the wire A, but is broken at K, which may be supposed to be thewindow of the parlor, and arranged so that the raising of the windowwill close the circuit,

0 leads to the opposite pole of the battery, passing through thevibrating armature, clectro-magnetic, and

the alarm X.

The wires 'being brought into contact at the point K, an electricalcircuit is established through the alarm and magnet B, causing'thearmature to be attracted, thus raising the point of the rod or bar Mfrom the slot in the disk G, or other device. The fall of the devicebrings the springs H and B into connection, whereby a second andindependentcircuitis established through the wire I and springs H andH", which can only be broken byraisin'g the disk or other deviceseparating the springs H? and H.

p In the usualmethods of indicating, when the two poles of the batteryare connected the alarm is sounded, and the indicators (by breaking thatpole of the battery which has been connected with the ordinary devices)show where it comes from; but if the connection is broken before theperson who has charge of the indicator reaches it, the alarm ceases, andthen it does not show what point or points it came from;

but with this indicator, the instant that a connection is made, and thecurrent of electricity passes to and through its magnets, the alarmcontinues to sound, (and the indicator shows upon its face the point orpoints Avhiclr caused it) until theperson having it in charge chooses tostop it by breaking the connection at H and H as'described and shown inthe drawing.

Having thus described my invention, I claim as new and desire to secureby Letters Patent An alarm-nidicator arranged for automatically causinga secondary and independent circuit at the indicators by the action ofthe armature lever with a disk brother device, and the springs or otherclosing de vioes','and a secondary line of wire, I, H connecting thebattery and the magnet, allsubstantially as specified. i

The above specification of my invention signed by me this 3d day ofMarch, 1870.

JAMES P. SNYDER. Witnesses GEO. W. MABEE, ALEX. F. Ronnnrs.

